Answer:
6 -

3² -

7 -
= 
Step-by-step explanation:
1. 6 - 
First, apply the exponent to 2/3. Because it's to the second power, multiply 2/3 by itself.

6 - 
Now, subtract.
6 -
= 
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2. 3² - 
First, apply the exponent.
3² = 9
9 - 
Now, subtract.
9 - 

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3. 7 - 
First, apply the exponent.
= 
7 - 
Now, subtract.
7 - 
hope this helps!